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comment by wasoxygen
wasoxygen  ·  62 days ago  ·  link  ·    ·  parent  ·  post: Everything you ever need to know about how the eye sees colors

Puffin beaks are fluorescent

    Unlike humans, birds have always known about the extra colours in the puffin bill. That's because they can see a whole other dimension of hues, said Dunning.

    Humans see colours that are a mix of red, blue and green light, he notes, while birds have a fourth colour in the mix — a property called tetrachromatic vision.